S-90273A113 4-40 x 3/4" ASME B18.6.3 Steel Phillips Flat Head Screws
Steel Phillips Flat Head Screws
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Basic Information
Head Parameters
Dimensions
Thread Parameters
Tip & Drive Parameters
Material & Strength
Temperature & Environment
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Key Features & Benefits at a Glance
- Superior corrosion resistance with zinc-plated steel construction, extending service life in demanding industrial environments
- Exceptional 60,000 psi tensile strength provides reliable performance under high-stress applications
- Class 2A thread fit with UNC coarse spacing ensures smooth installation and secure fastening in various materials
- 82° countersink angle with standard flat head profile enables flush mounting for clean, professional finishes
- Full threading and Phillips No. 1 drive delivers maximum grip strength and convenient installation
- Rockwell B70 hardness rating maintains structural integrity through repeated use and vibration
- Comprehensive compliance with ASME B18.6.3, RoHS 3, and REACH standards for quality assurance
Professional Applications & Engineering Value
These 4-40 UNC flat head screws deliver critical engineering solutions where flush mounting and high tensile strength are paramount. The zinc-plated steel construction provides essential corrosion protection for industrial equipment, machinery assemblies, and electronic enclosures exposed to harsh conditions. With coarse thread spacing and Class 2A thread fit, these fasteners prevent cross-threading and ensure reliable engagement in both metal and composite materials. The fully threaded design maximizes holding power across the entire 3/4" length, while the Phillips No. 1 drive facilitates efficient installation in confined spaces. Ideal for automotive components, manufacturing fixtures, and electrical panel applications where vibration resistance and dimensional stability are critical.
Specification Summary & Compliance
Manufactured to precise dimensional standards with Class 2A thread fit tolerance ensuring consistent performance across production runs. Complies with ASME B18.6.3 specifications for dimensional accuracy and mechanical properties. Meets RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) environmental compliance requirements, confirming the absence of restricted substances. The UNC coarse thread series with right-hand threading follows industry-standard fastening protocols for reliable interoperability with existing components and tooling systems.
